Submarine 707 (サブマリン707, Sabumarin 707) is a Japanese manga series written and illustrated by Satoru Ozawa and serialized in Weekly Shōnen Sunday between 1963 and 1965.

The first OVA, titled Submarine 707: Deep Sea Fleet (深海の艦隊 サブマリン707, Shinkai no Kantai: Sabumarin 707), was produced by Knack Productions and released on 10 January 1997.

Arriving late in the battle, Captain Hayami deliberately steers the 707 into the way of a torpedo launched at the supercarrier that serves as the PKN's flagship.

Six months later, Captain Hayami is given command of a completely new 707, and takes on a crew of old comrades and brand new cadets to battle Admiral Red once more.

The first original attempt for an anime series based on the manga was planned back in 1964 but around the same time released as an audio drama on sonosheet (ソノシート, sonoshīto, a very thin-sized record).